On average, listings lease in the $10's per square foot per year. The Oregon City region is going through a decline in rates. In the last 3 months, the median rate decreased $2 per sqft per year. That's a 12% decline in rent.
Compared to the rest of the Greater Portland market, the Oregon City submarket has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 3 listings have been listed, which means new listings are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 200 sqft. Most buildings in this region are approximately 1 stories. Most buildings in this market were built in 1991 and are Class B.